Once strictly off-limits, this lower level housing curious and priceless vehicles of the Petersen Automotive Museum is now open to the public.

This star-studded Old Hollywood restaurant is where fettuccine Alfredo made its United States debut.

The final resting place of a space program monolith.

The abandoned zoo enclosures offer a perfect place to experience the other side of the bars.

The legendary building that needed ghostly approval before being built.

America's most famous piece of self-built architecture.

The oldest family-run restaurant in the United States is a living museum of New Orleans dining history.

This Memphis recording studio launched the careers of Jerry Lee Lewis, Johnny Cash, and Elvis Presley.

The hotel where Martin Luther King Jr. was shot is now a museum dedicated to his work.

An otherwise quiet campground becomes a bustling medieval town for two weeks every year.

This concrete tangle of square pipes has stood as a proud thorn in the city's side since the '70s.

A collection of 20th-century automata, penny arcade games, and musical contraptions.

San Francisco's newly reopened hands-on science museum.

A psychedelic labyrinth on the San Francisco bay.

The final resting place of the tragic king and queen of the Jazz Age is tucked away in a small Maryland graveyard.

The longest escalator in the Western Hemisphere takes over three minutes to ride down.

This abandoned bootleg attraction was built to cash in on the popularity of classic TV show, F Troop.

This replica of the Greek structure is in the heart of Nashville.

This historic hotel on Bathhouse Row in Hot Springs National Park has a storied history of gangsters and baseball greats.

Where animatronic singing fish go to retire.

Elvis's own personal tropical hideaway.

A home designed to be on the cutting edge of comfortable, low-cost living.

The scant remains of an expansive indigenous civilization can be seen at this Arkansas state park.

These delicate buggers are some of the rarest fossils that have bubbled up from the Tar Pits.